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Cross‐resistance between strains of Bacillus sphaericus but not B. thuringiensis israelensis in colonies of the mosquito Culex quinquefasciatus
Author(s) -
Yuan Z. M.,
Pei G. F.,
Regis L.,
NielsenLeroux C.,
Cai Q. X.
Publication year - 2003
Publication title -
medical and veterinary entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.028
H-Index - 82
eISSN - 1365-2915
pISSN - 0269-283X
DOI - 10.1046/j.1365-2915.2003.00429.x
Subject(s) - bacillus sphaericus , culex quinquefasciatus , biology , bacillus thuringiensis , bacillales , microbiology and biotechnology , bacillaceae , culex , cross resistance , bacteria , larva , botany , genetics , aedes aegypti , bacillus subtilis
. Two colonies of Culex quinquefasciatus Say (Diptera: Culicidae) were selected with Bacillus sphaericus strains C3‐41 and IAB59 in the laboratory for 13 and 18 generations; they attained 145 000‐ and 48.3‐fold resistance, respectively, in comparison with a susceptible laboratory colony (SLCq) and showed very high levels of cross‐resistance (8500‐ to 145 000‐fold) to B. sphaericus strains C3‐41, 1593, 2297 and 2362. They were relatively susceptible to B. sphaericus strains LP1‐G and 47‐6B (only 0.8‐ to 2.8‐fold tolerance), with 24.8‐ to 48.3‐fold cross‐resistance to strain IAB59. B. sphaericus ‐resistant mosquito colonies remained highly susceptible to B. thuringiensis israelensis , suggesting that B.t.i. would be of value in the management of B. sphaericus ‐resistant Cx. quinquefasciatus colonies. The demonstration of low or no cross‐resistance of two selected resistant Cx. quinquefasciatus colonies to IAB59, LP1‐G and 47‐6B strains of B. sphaericus and the finding of a major 49 kDa protein in these strains suggest that there is likely to be another mosquitocidal factor in the three strains.